p0118 - 1 mm 3 of water at STP contains 3 . 34 · 10 19...

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1.18. CHAPTER 1, PROBLEM 18 19 1.18 Chapter 1, Problem 18 Problem: How long would it take to count the molecules in a cubic micron of water (1 micron is 10 4 cm) with a very fast electronic counter that can count at a rate of three million molecules per second? Solution: One micron is 10 4 cm, which is also 10 3 mm. We know from the text that
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Unformatted text preview: 1 mm 3 of water at STP contains 3 . 34 · 10 19 molecules. Hence, 1 cubic micron of water contains 3 . 34 · 10 10 molecules. The time to count them at a rate of three million per second is t = 3 . 34 · 10 10 molecules 3 · 10 6 molecules / sec = 11133 seconds = 3 . 09 hours...
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This note was uploaded on 02/09/2012 for the course AME 309 taught by Professor Phares during the Spring '06 term at USC.

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